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Check Engine Light On

Silv.4X4

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Silv.4X4 Enthusiast

Silv.4X4

Posted
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Alright, well, My Check Engine Light keeps coming on. I have a Hypertech PPIII and I Checked the code, and the code came up P0101. So I went on the internet and found that it was from the Mass Airflow Sensor getting an incorrect reading, or an incorrect amount of air going through it. I never got the light, but I bought an Air intake a while back and ever since then it goes on when it reaches just about any RPM above 3500. Its not really a problem, but it just bugs me that my check engine light is on. So I was wondering if anyone new of a way to bypass it... or something to that affect. Im not sure it can be done...but hey some of you guys know a pretty good amount of stuff about these trucks..so I figured id give it a try. Thanks

benjamintx Enthusiast

benjamintx

Posted
Posted

check your gas cap, it might just coincidently need replacing. Your light will come on if it doesn't seal. If it is your mass airflow sensor, try cleaning it by spraying carb cleaner on it. It can become covered in soot and that might be your problem, especially if you notice your truck idling rough or starting rough. Other than that, it might just be a hazard of putting aftermarket things on computerized rides, the computer might not be calibrated right.

 

Not sure how to turn the light off other than ripping the dash and taking the bulb out.

hotwheels57 Enthusiast

hotwheels57

Posted
Posted

I'll try my best here...this is fairly common with the installation of an air intake on vehicles. You do not want to "bypass" any of the codes. You need to determine the cause of the problem and resolve it. This shouldn't be hard since it's been occurring since your installation. I'm assuming you did the installation so you're familiar with the system. Your profile says this is a "custom" air intake. So, this isn't an after market system like K&N, VOLANT, AIRAID, etc?

Did you by any chance change your oem MAF to an after market MAF like a GRANATELLI? They do not have a good reputation and frequently have such issues. Did you by any chance modify your MAF by removing the screen (if there was one)? Any modification could have changed the calibration, possibly requiring a professional tune.

It's possible that the MAF has failed, but not likely. Before you replace it, check the installation for any sources of air leaking. Also, check all wires to the MAF at the connections. Check any small vacuum hose connection to the intake. Check any hose connection from the valve cover to the intake. Make certain that everything is tight and secure and incapable of drawing outside air where it shouldn't. Basically, you're looking for any source of air that could enter the system at any point other than the air filter.

Check the air filter for damage as well. If this is an after market oiled gauze filter, have you used to much oil on the gauze media, which could transfer to the MAF sensor wires? You can buy MAF specific aerosol cleaner to periodically clean the sensor wires.

Look at everything from the throttle body to the air filter. Any place where there is a hose clamp, make sure there is no "puckering" of the rubber seal beneath the clamp. Make sure that the clamp hasn't failed or loosened allowing unmetered air into the MAF.

Check to see if there are any holes in the intake that should be plugged, such as for a dirty filter gauge...that silly little colorful piece of plastic that's supposed to change colors when the filter is dirty. Some people fail to install them, leaving a gaping hole to draw unfiltered/unmetered air.

If this is a "custom" air intake, as in DIY/homemade, it's entirely possible that you've got an intake that isn't going to work on your engine w/o throwing codes. You could always reinstall the oem intake and see if that resolves the code.

Silv.4X4 Enthusiast

Silv.4X4

Posted
  • Author
Posted
I'll try my best here...this is fairly common with the installation of an air intake on vehicles. You do not want to "bypass" any of the codes. You need to determine the cause of the problem and resolve it. This shouldn't be hard since it's been occurring since your installation. I'm assuming you did the installation so you're familiar with the system. Your profile says this is a "custom" air intake. So, this isn't an after market system like K&N, VOLANT, AIRAID, etc?

Did you by any chance change your oem MAF to an after market MAF like a GRANATELLI? They do not have a good reputation and frequently have such issues. Did you by any chance modify your MAF by removing the screen (if there was one)? Any modification could have changed the calibration, possibly requiring a professional tune.

It's possible that the MAF has failed, but not likely. Before you replace it, check the installation for any sources of air leaking. Also, check all wires to the MAF at the connections. Check any small vacuum hose connection to the intake. Check any hose connection from the valve cover to the intake. Make certain that everything is tight and secure and incapable of drawing outside air where it shouldn't. Basically, you're looking for any source of air that could enter the system at any point other than the air filter.

Check the air filter for damage as well. If this is an after market oiled gauze filter, have you used to much oil on the gauze media, which could transfer to the MAF sensor wires? You can buy MAF specific aerosol cleaner to periodically clean the sensor wires.

Look at everything from the throttle body to the air filter. Any place where there is a hose clamp, make sure there is no "puckering" of the rubber seal beneath the clamp. Make sure that the clamp hasn't failed or loosened allowing unmetered air into the MAF.

Check to see if there are any holes in the intake that should be plugged, such as for a dirty filter gauge...that silly little colorful piece of plastic that's supposed to change colors when the filter is dirty. Some people fail to install them, leaving a gaping hole to draw unfiltered/unmetered air.

If this is a "custom" air intake, as in DIY/homemade, it's entirely possible that you've got an intake that isn't going to work on your engine w/o throwing codes. You could always reinstall the oem intake and see if that resolves the code.

Thanks for the reply I appreciate the time you took. But The MAF sensor is the stock one and I havent modified it in any way. Ive cleaned it with MAF cleaner, and that didnt help. The connections seem fine, and the wires do to. The filter is brand new and i can still see daylight through it. It says its custom..but theres nothing to custom about it. I bought the parts and put it on, but it is a pretty straight shot to the intake manifold, there arent to many bends or anything..and its 4" pipe the whole way. Could it be that Im just getting too much air, and the MAF sensor isnt used to that and thats whats setting it off, becuase the intake is pretty free flowing.

hotwheels57 Enthusiast

hotwheels57

Posted
Posted

The oem computer has parameters that will adjust for the increase of air/fuel within its factory set limits (in %). Have you modified any of the oem AFR settings with your HYPERTECH? (I don't know if that's even possible)...

Your custom system could be allowing more air than the computer can compensate for and is outside those parameters. The computer may not be able to compensate to correct for the AFR. That's why I suggested a professional tune might be necessary.

Are you certain that's the only code that's going off?

Silv.4X4 Enthusiast

Silv.4X4

Posted
  • Author
Posted
The oem computer has parameters that will adjust for the increase of air/fuel within its factory set limits (in %). Have you modified any of the oem AFR settings with your HYPERTECH? (I don't know if that's even possible)...

Your custom system could be allowing more air than the computer can compensate for and is outside those parameters. The computer may not be able to compensate to correct for the AFR. That's why I suggested a professional tune might be necessary.

Are you certain that's the only code that's going off?

Im pretty sure I havent adjusted any of those settings, and as for the code..as far as I know its the only one. And Im not sure if Ive mentioned before...but the check engine light goes on and off??

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